package scenic.study.thinkinjava.io;//: c11:Blip3.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Reconstructing an externalizable object.

import java.io.Externalizable;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

class Blip3 implements Externalizable {
    int i;
    String s; // No initialization

    public Blip3() {
        System.out.println("Blip3 Constructor");
        // s, i not initialized
    }

    public Blip3(String x, int a) {
        System.out.println("Blip3(String x, int a)");
        s = x;
        i = a;
        // s & i initialized only in nondefault
        // constructor.
    }

    public String toString() {
        return s + i;
    }

    public void writeExternal(ObjectOutput out)
            throws IOException {
        System.out.println("Blip3.writeExternal");
        // You must do this:
        out.writeObject(s);
        out.writeInt(i);
    }

    public void readExternal(ObjectInput in)
            throws IOException, ClassNotFoundException {
        System.out.println("Blip3.readExternal");
        // You must do this:
        s = (String) in.readObject();
        i = in.readInt();
    }

    public static void main(String[] args)
            throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        Blip3 b3 = new Blip3("A String ", 47);
        System.out.println(b3);
        ObjectOutputStream o =
                new ObjectOutputStream(
                        new FileOutputStream("Blip3.out"));
        System.out.println("Saving object:");
        o.writeObject(b3);
        o.close();
        // Now get it back:
        ObjectInputStream in =
                new ObjectInputStream(
                        new FileInputStream("Blip3.out"));
        System.out.println("Recovering b3:");
        b3 = (Blip3) in.readObject();
        System.out.println(b3);
    }
} ///:~